Wrong answer in ADDSQURE

Question link: https://www.codechef.com/OCT20B/problems/ADDSQURE
APPROACH: I found the differences between every possible horizontal lines and vertical lines . I added a new horizontal line and found differences. I checked if there is same difference in vertical lines so that the square forms.

#include<iostream>
#include<bits/stdc++.h>
#include <cmath>
#include<vector>
using namespace std;
int main()
{
    long w,h,n,m;
    cin >> w >> h >> n >> m;
   
    long ar[n],br[n];

    for(int i=0;i<n;i++)
    cin >> ar[i];

    for(int i=0;i<m;i++)
    cin >> br[i];

    long long max=0;
    long long vertical[100000];
    long long horizontal[100000];

    for(int i=0;i<100000;i++)
    {
        vertical[i]=0;
        horizontal[i]=0;
    }

    for(int i=0;i<n-1;i++)
    {
        for(int j=i+1;j<n;j++)
        {
            vertical[(abs(ar[i]-ar[j]))]++;
        }
    }

     for(int i=0;i<m-1;i++)
        {
            for(int j=i+1;j<m;j++)
            {
                horizontal[(abs(br[i]-br[j]))]++;
            }
            
        }

    for(int k=0;k<=h;k++)
    {
         long long count=0;
        for(int i=0;i<m;i++)
        {
            horizontal[abs(k-br[i])]++;
        }
       
       
        for(int i=1;i<100000;i++)
        {
            if(horizontal[i]*vertical[i] !=0)
            count++;
        }

        if(count>=max)
        max=count;

        for(int i=0;i<m;i++)
        {
            horizontal[abs(k-br[i])]--;
        }
        
    }

    cout << max << endl;
}

Solution link: https://www.codechef.com/OCT20B/submit/ADDSQURE

THANK YOU.

hi

long ar[n],br[n];
this should be
long ar[n],br[m];
One more thing,you are taking k from 0 to h in last loop but you can not take k in horizontal array(it is mentioned).

Thanks a lot